T-distribution

t-distribution

60%

70%

80%

85%

Confidence Level

90%

95%

98%

99%

99.8%

99.9%

2 Tailed

1 Tailed

0.40

0.20

0.30

0.15

0.20

0.10

Level of Significance

0.15

0.10

0.05

0.02

0.075 0.05 0.025 0.01

0.01

0.005

0.002

0.001

0.001

0.0005

df

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

40

50

60

70

80

90

100

1.376

1.060

0.978

0.941

0.919

0.906

0.896

0.889

0.883

0.879

0.875

0.873

0.870

0.868

0.866

0.865

0.863

0.862

0.861

0.860

0.859

0.858

0.857

0.857

0.856

0.856

0.855

0.855

0.854

0.854

0.851

0.849

0.848

0.847

0.846

0.846

0.845

1.963

1.385

1.250

1.190

1.156

1.134

1.119

1.108

1.100

1.093

1.088

1.083

1.079

1.076

1.074

1.071

1.069

1.067

1.066

1.064

1.063

1.061

1.060

1.059

1.058

1.058

1.057

1.056

1.055

1.055

1.050

1.047

1.045

1.044

1.043

1.042

1.042

3.133

1.883

1.637

1.533

1.476

1.440

1.415

1.397

1.383

1.372

1.363

1.356

1.350

1.345

1.341

1.337

1.333

1.330

1.328

1.325

1.323

1.321

1.319

1.318

1.316

1.315

1.314

1.313

1.311

1.310

1.303

1.299

1.296

1.294

1.292

1.291

1.290

4.195

2.278

1.924

1.778

1.699

1.650

1.617

1.592

1.574

1.559

1.548

1.538

1.530

1.523

1.517

1.512

1.508

1.504

1.500

1.497

1.494

1.492

1.489

1.487

1.485

1.483

1.482

1.480

1.479

1.477

1.468

1.462

1.458

1.456

1.453

1.452

1.451

6.320

2.912

2.352

2.132

2.015

1.943

1.895

1.860

1.833

1.813

1.796

1.782

1.771

1.761

1.753

1.746

1.740

1.734

1.729

1.725

1.721

1.717

1.714

1.711

1.708

1.706

1.703

1.701

1.699

1.697

1.684

1.676

1.671

1.667

1.664

1.662

1.660

12.69

4.271

3.179

2.776

2.570

2.447

2.365

2.306

2.262

2.228

2.201

2.179

2.160

2.145

2.131

2.120

2.110

2.101

2.093

2.086

2.080

2.074

2.069

2.064

2.060

2.056

2.052

2.048

2.045

2.042

2.021

2.009

2.000

1.994

1.990

1.987

1.984

31.81

6.816

4.525

3.744

3.365

3.143

2.999

2.897

2.822

2.764

2.719

2.682

2.651

2.625

2.603

2.584

2.567

2.553

2.540

2.529

2.518

2.509

2.500

2.493

2.486

2.479

2.473

2.468

2.463

2.458

2.424

2.404

2.391

2.381

2.374

2.369

2.365

63.67

9.520

5.797

4.596

4.030

3.707

3.500

3.356

3.250

3.170

3.106

3.055

3.013

2.977

2.947

2.921

2.899

2.879

2.861

2.846

2.832

2.819

2.808

2.797

2.788

2.779

2.771

2.764

2.757

2.750

2.705

2.678

2.661

2.648

2.639

2.632

2.626

¡ª

19.65

9.937

7.115

5.876

5.201

4.783

4.500

4.297

4.144

4.025

3.930

3.852

3.788

3.733

3.687

3.646

3.611

3.580

3.552

3.528

3.505

3.485

3.467

3.451

3.435

3.421

3.409

3.397

3.386

3.307

3.262

3.232

3.211

3.196

3.184

3.174

¡ª

26.30

12.39

8.499

6.835

5.946

5.403

5.039

4.780

4.586

4.437

4.318

4.221

4.141

4.073

4.015

3.965

3.922

3.884

3.850

3.820

3.792

3.768

3.746

3.725

3.707

3.690

3.674

3.660

3.646

3.551

3.496

3.460

3.435

3.417

3.402

3.391

¡Þ

0.842

1.036

1.282

1.440

1.645

1.960

2.327

2.576

3.091

3.291

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